Christians – 2.23 billion people (33.32% of the world’s population)
Muslims – 1.41 billion people (21.01%)
Hindus – 889 million people (13.26%)
Buddhists – 392 million people (5.84%)
Sikhs – 23.5 million people (0.35%)
Jews – 15.4 million people (0.23%)
Baha’is – 8.05 million people (0.12%)
Other Religions – 790 million people (11.78%)
Non-Religious – 789 million people (11.77%)
Atheists – 156 million people (2.32%)
* These numbers are based on a world population of 6,706,993,152 given by the CIA World Factbook – https://www.cia.gov/library/publications/the-world-factbook/.